An amount of money paid in advance as security against the payor's non-performance of a contractual obligation.

plural of security community

The protection of information and information systems from unauthorized access and disruption.

(Internet) Security as it pertains to the Internet, such as information security.

A hardware system that prevents unauthorised intrusion into a premises, and reports such attempts. / (computing) A similar software system that prevents unauthorised access.

A facility or part of a facility with minimal restrictions, designed to hold the least dangerous criminals of society.

a prison with more restrictions designed to hold the most dangerous criminals of society; supermax.

plural of security camera

A government organisation established to protect its nation and its secrets from enemies. / Used other than figuratively or idiomatically: see security, service.

A producer of printed documents or products which are physically protected against forgery, counterfeiting and alteration by security features